Geo-Sense Mini-Streamers
RESOURCES
Single Channel Arrays of 8 to 24+ Elements
Operational Features
· Specifically designed for the high
frequency spectrum emitted by VHR
sources (sparkers, boomers, pingers)
· The short 8-element array has proven
successful down to 4500 m water depths
· The active length and number of elements
can be configured to your requirements
· Can be used with any Third Party
recording system (in combination with
the Geo-Sense Filter/Gain Interface)
Applications
For use with our VHR single channel data
acquisition systems: Geo-Trace, Mini-Trace,
or any other recording system
· Site and route surveys
· Sand searches
· Oceanographic research
AQ-2000 Hydrophone
Geo-Sense streamers are equipped with the AQ-2000
hydrophones - the latest innovative acoustic sensor
technology for both shallow and deep water exploration.
Tow Cable
Length:
Diameter:
Type:
Insulation:
Strain member:
Standard 50 m to 100 m
11 mm
3 x 2 x 24 AWG screened twisted pair
Polyurethane
Double reverse spiral Kevlar
Active Section & Jacket
The AQ-2000 is well suited for applications that require
stable performance over a wide range of water depths.
It has excellent acceleration-cancelling qualities and an
exceptionally wide frequency bandwidth.
The AQ-2000 can be installed into standard array
configurations or integrated into custom-moulded
packages.
Every hydrophone is tested for sensitivity, capacitance
and insulation to ensure the highest quality product for all
very high resolution seismic operations.
Number of elements:
8 to 24+
Spacing of elements:
Length of active section:
Length of jacket:
Jacket size ID & OD:
Jacket material:
Buoyancy:
Array fluid:
0.4 m standard
2.8 m / 9.2 m (for 8 / 24elements)
4.8 m / 11.2 m (approx.)
20.5 mm & 26.5 mm
Unreinforced polyurethane
Slightly negative
Shell Sol T/ Isopar
Power to Preamplifier
For streamers other than Geo-Sense, a standard battery
box of 12 V DC from penlight batteries can be used.
Geo-Sense Mini-Streamers
Technical Specifications
RESOURCES
AQ-2000 Hydrophone
Performance
Electrical Specifications
Sensitivity @ 100 Hz
Free-field voltage:
-201 dB re 1 V/µPa +/- 1.5 dB
Leads:
Two 28 AWG stranded
conductors (red and black),
Hytrel® insulation, 12.7 cm
length each
Connector:
None
Polarity:
A positive increase in acoustic
pressure generates a positive
voltage on the red conductor
Capacitance: 4.5 nF +/- 25% at 20°C and 1 kHz
Resistance:
100%
500 MΩ minimum across leads
or to sea water at 20°C and
relative humidity, 50 V DC
Dissipation:
0.02 typical
Mechanical
Resonance typically 20 kHz in water
Maximum operating depth of 2000 m
Destruction depth of more than 7000 m
Pre-Amplifier
Materials:
Fluoroelastomer, high strength
epoxy, Hytrel® insulated leads
Weight in air:
14 grams
Size:
4.56 cm long x 1.32 cm diameter
Size: 60 x 16 mm
Gain: 26 dB
Ground reference:
Single-ended
Temperature:
Power :
9 -12 V DC (polarity protected)
High-pass: -3 dB: 3 Hz
Low-pass: -3 dB:13 kHz
Output impedance: 60 Ω
Operating: -10°C to 50°C
Storage: -40°C to 60°C
AQ-2000 Sensitivity vs Depth
-180
dB re 1 V/µPa
Phone: +31 (0)10 4258370
Fax: +31 (0)10 2440104
E-mail: info@geo-resources.com
Website: www.geo-resources.com
Acceleration Sensitivity
Output is <1.5 mV/g due to acceleration in any of
the three major axes at 20 Hz
Physical Specifications
Displacement: 6.24 cc
-190
-200
-210
-220
dB re 1 V/µPa
100
Geo-Resources Instruments
Heemraadssingel 235
3023 CD Rotterdam
The Netherlands
Sensitivity Change
Versus frequency: +/- 0.25 dB from 1 Hz to 1 kHz
(+/-2.0 dB from 1 kHz to 10 kHz)
Versus depth : < 0.5 dB to 1000 m
Versus temperature: < 0.03 dB per 1°C change
Depth (m)
1000
10000
AQ-2000 Sensitivity Response
-180
-190
-200
-210
-220
1
10
100
1000
Frequency (Hz)
10 000
100 000